A-27 



The first ten end-members (species or species groupings) 

 are identified in Table IV. Five of these are monospecific, 

 meaning their distribution is independent of all other 

 species in this sample set. Four of the factors are dispe- 

 cific, being composed of two species whose distributions are 

 similar and hence may be controlled by similar parameters. 

 The other factor was composed of three species whose distri- 

 butions were similar. 



When these ten end-members are listed against depth 

 three major faunal zones are discernible (Table V) . However, 

 there are minor replacements within the zones with increasing 

 depth. The shallow samples (100-350 m) are composed of two 

 of these end-members: the monospecific white sea pen (9) 

 which is independently distributed, and the Cevianthus 

 bovealis , Cancer borealis arid Munida valida assemblage (4). 

 The distributions of these three species tend to coincide, 

 indicating that they may be largely controlled by similar 

 parameters. The middle zone (600-1600 m) is composed of a 

 combination of several end-member groups (2, 3, 5, 6, 7, 8 

 and 10), both mono and dispecific. This means that there is 

 no recognizable cohesive grouping of organisms (i.e. a 

 community) within this zone. However, one or two of these 

 factors tend to dominate this zone within a given area. The 

 deeper zone ( 1600 m) is largely composed of two independent 

 end-members, the monospecific Ophiomusium lymani (1) and the 

 cerianthid anemone and Echinus affinis grouping (7) . 



